PIR Motion Sensor
The PIR (Passive Infrared) Motion Sensor is commonly used in motion detection applications, such as security systems, lighting control, and home automation. It detects infrared radiation (heat) emitted by objects, particularly living beings like humans and animals, within its range. The sensor has a pyroelectric sensor that senses changes in infrared radiation as a person or animal moves in or out of its detection area. The PIR sensor is typically used to detect movement in the surrounding environment by measuring changes in heat.
The PIR sensor typically has two main components: a pyroelectric element and a fresnel lens. The pyroelectric element detects infrared radiation, while the fresnel lens focuses infrared light onto the element, increasing its sensitivity. When the sensor detects a change in infrared radiation (e.g., the movement of a person), it generates a signal that can be processed by a microcontroller like Arduino.
Most PIR motion sensors have a digital output, triggering a HIGH or LOW signal when motion is detected or when there is no motion. This makes them ideal for triggering events such as turning on lights, activating alarms, or sending notifications when movement is detected. The HC-SR501 is a commonly used PIR sensor module that is easy to interface with microcontrollers and allows users to adjust sensitivity and delay time for different applications.
The PIR sensor typically has two main components: a pyroelectric element and a fresnel lens. The pyroelectric element detects infrared radiation, while the fresnel lens focuses infrared light onto the element, increasing its sensitivity. When the sensor detects a change in infrared radiation (e.g., the movement of a person), it generates a signal that can be processed by a microcontroller like Arduino.
Most PIR motion sensors have a digital output, triggering a HIGH or LOW signal when motion is detected or when there is no motion. This makes them ideal for triggering events such as turning on lights, activating alarms, or sending notifications when movement is detected. The HC-SR501 is a commonly used PIR sensor module that is easy to interface with microcontrollers and allows users to adjust sensitivity and delay time for different applications.
